id_type
typedef TeamThreadIteratorEntry<id_type> iterator_type;
id_type id; // -1 for iterator entries, >= 0 for actual elements
typedef id_type KeyType;
size_t HashKey(id_type key) const
bool Compare(id_type key, Element* value) const
typedef typename Element::id_type id_type;
Element* Lookup(id_type id, bool visibleOnly = true) const